I am waiting for her to arrive in the living room of my home. She... Sakita Mirai-chan is my wife's little sister, and my sister-in-law who is 20 years younger than me. A few days ago, my wife slipped on the stairs of a pedestrian bridge on a rainy day, broke bones, and was hospitalized. Each individual injury seems relatively mild for a fracture, but since she hurt multiple places it is complicated in various ways, and the hospitalization and rehabilitation look like they will drag on. Even after discharge she does not seem likely to be able to move around right away. Because of that, upon learning of my wife's hospitalization, Mirai-chan decided to move in for a while as a housekeeper and commute to junior college from our place -- 'Funfufu~, fufu~... fufuun...' '...Eh? Eeeeh...!?' Mirai-chan put on a triangular headscarf and started cleaning the room. Completely naked. Suddenly stripping naked and exposing and shaking those huge breasts that I always carefully try not to stare at. 'Brother-in-law, just sit there? I'm good at housework! I also like moving my body, ahaha...' 'No, that's not the issue...!' And so begins the lewd service life by my sister-in-law.